After opening up a ticket because the EasyApache 3 scripts broke phpsuexec, etc. and still trying to figure things out...we had to switch to using DSO for the script handler instead of suphp. After hours of reconfiguring hosted sites that had php flag overrides in php.ini files (DSO doesn't support this...you have to use .htaccess) ... I saw this post.

Thank you inteliport!! I deleted the /tmp/sess_ files and changed the phpsuexec handler back to suphp, and everything is as it was before. NO ONE ever suggested this to us!

EDIT: Now, if we could just get the userdir mod to work again I'd be okay with the EA3 update.